tests

Generate `distutils-stubs` on install #6196

Job	Run time
test_cygwin (39, windows-latest)	1m 5s
collateral (diffcov)	1m 20s
test (3.9, ubuntu-latest)	1m 18s
collateral (docs)	1m 19s
test (3.9, macos-latest)	1m 22s
test (3.9, windows-latest)	1m 7s
test (3.13, ubuntu-latest)	1m 19s
test (3.13, macos-latest)	1m 24s
test (3.13, windows-latest)	1m 3s
test (3.10, ubuntu-latest)	1m 19s
test (3.11, ubuntu-latest)	1m 18s
test (3.12, ubuntu-latest)	1m 20s
test (3.14, ubuntu-latest)	1m 5s
test (pypy3.10, ubuntu-latest, stdlib)	1m 17s
test (ubuntu-latest, 3.10, stdlib)	1m 17s
integration-test	1s
check	2s
release	1s
	18m 57s

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